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Integrated Serial Port 1 / Serial Port 2
This setting lets you specify the resources for the first and second serial ports on the motherboard. The exact name used for the various options varies (some call them "COM1", "COM2", etc. while others just list the I/O address and IRQ options). For each serial port setting you will typically find these:
Normally you will set the first serial port to the resource settings for COM1, and the second to COM2. If you are using an internal modem and you want it to be set up by your system as COM2, the easiest way to do this without generating any conflicts is to disable the second serial port here, to prevent interference.
Next: Integrated Parallel Port